138 lines
4.8 KiB
C
138 lines
4.8 KiB
C
/****************************************************************************
|
|
* arch/sim/src/up_unblocktask.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2013, 2015 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sched.h>
|
|
#include <debug.h>
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/sched.h>
|
|
|
|
#include "clock/clock.h"
|
|
#include "sched/sched.h"
|
|
#include "up_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: up_unblock_task
|
|
*
|
|
* Description:
|
|
* A task is currently in an inactive task list
|
|
* but has been prepped to execute. Move the TCB to the
|
|
* ready-to-run list, restore its context, and start execution.
|
|
*
|
|
* Inputs:
|
|
* tcb: Refers to the tcb to be unblocked. This tcb is
|
|
* in one of the waiting tasks lists. It must be moved to
|
|
* the ready-to-run list and, if it is the highest priority
|
|
* ready to run taks, executed.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void up_unblock_task(struct tcb_s *tcb)
|
|
{
|
|
struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head;
|
|
|
|
/* Verify that the context switch can be performed */
|
|
|
|
ASSERT((tcb->task_state >= FIRST_BLOCKED_STATE) &&
|
|
(tcb->task_state <= LAST_BLOCKED_STATE));
|
|
|
|
sdbg("Unblocking TCB=%p\n", tcb);
|
|
|
|
/* Remove the task from the blocked task list */
|
|
|
|
sched_removeblocked(tcb);
|
|
|
|
/* Reset scheduler parameters */
|
|
|
|
sched_resume_scheduler(tcb);
|
|
|
|
/* Add the task in the correct location in the prioritized
|
|
* g_readytorun task list
|
|
*/
|
|
|
|
if (sched_addreadytorun(tcb))
|
|
{
|
|
/* The currently active task has changed! */
|
|
/* Update scheduler parameters */
|
|
|
|
sched_suspend_scheduler(rtcb);
|
|
|
|
/* Copy the exception context into the TCB of the task that was
|
|
* previously active. if up_setjmp returns a non-zero value, then
|
|
* this is really the previously running task restarting!
|
|
*/
|
|
|
|
if (!up_setjmp(rtcb->xcp.regs))
|
|
{
|
|
/* Restore the exception context of the new task that is ready to
|
|
* run (probably tcb). This is the new rtcb at the head of the
|
|
* g_readytorun task list.
|
|
*/
|
|
|
|
rtcb = (struct tcb_s*)g_readytorun.head;
|
|
sdbg("New Active Task TCB=%p\n", rtcb);
|
|
|
|
/* The way that we handle signals in the simulation is kind of
|
|
* a kludge. This would be unsafe in a truly multi-threaded, interrupt
|
|
* driven environment.
|
|
*/
|
|
|
|
if (rtcb->xcp.sigdeliver)
|
|
{
|
|
sdbg("Delivering signals TCB=%p\n", rtcb);
|
|
((sig_deliver_t)rtcb->xcp.sigdeliver)(rtcb);
|
|
rtcb->xcp.sigdeliver = NULL;
|
|
}
|
|
|
|
/* Update scheduler parameters */
|
|
|
|
sched_resume_scheduler(rtcb);
|
|
|
|
/* Then switch contexts */
|
|
|
|
up_longjmp(rtcb->xcp.regs, 1);
|
|
}
|
|
}
|
|
}
|